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Loans - Loans Individually Evaluated for Impairment by Class of Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid principal balance | $ 66,585 | $ 95,358 |
Recorded investment | 56,564 | 70,426 | $ 80,664
Allowance for loan losses allocated | 684 | 548 |
Impaired Financing Receivable, Average Recorded Investment | 67,070 | 79,496 | 70,762
Impaired Financing Receivable, Interest Income, Cash Basis Method | 2,708 | 4,777 | 1,963
Commercial, financial and agricultural |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 18,039 | 20,624 | 30,595
Impaired Financing Receivable, Average Recorded Investment | 23,154 | 26,821 | 20,179
Impaired Financing Receivable, Interest Income, Cash Basis Method | 963 | 885 | 340
Commercial real estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 18,142 | 24,474 | 18,025
Impaired Financing Receivable, Average Recorded Investment | 21,692 | 22,828 | 17,883
Impaired Financing Receivable, Interest Income, Cash Basis Method | 903 | 884 | 550
Commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 1,324 | 2,226 | 6,720
Impaired Financing Receivable, Average Recorded Investment | 1,729 | 5,503 | 7,732
Impaired Financing Receivable, Interest Income, Cash Basis Method | 64 | 66 | 47
Commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 19,059 | 23,102 | 25,324
Impaired Financing Receivable, Average Recorded Investment | 20,490 | 24,341 | 24,968
Impaired Financing Receivable, Interest Income, Cash Basis Method | 778 | 2,942 | $ 1,026
Consumer |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 5 | 3 |
With no related allowance recorded | Commercial, financial and agricultural |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid principal balance | 19,899 | 41,075 |
Recorded investment | 14,704 | 19,965 |
With no related allowance recorded | Commercial real estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid principal balance | 18,974 | 23,961 |
Recorded investment | 18,060 | 23,474 |
With no related allowance recorded | Commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid principal balance | 2,788 | 3,662 |
Recorded investment | 1,324 | 2,226 |
With no related allowance recorded | Commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid principal balance | 19,346 | 24,409 |
Recorded investment | $ 19,012 | $ 22,687 |

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